[libc++] Rework compressed pair constructors.

This patch de-duplicates most compressed pair constructors
to use the same code in C++11 and C++03.

Part of doing that is deleting the "__second_tag()" and replacing
it with a "__value_init_tag()" which has the same effect, but
allows for the removal of the special "one-arg" first element
constructor.

This patch is intended to have no semantic change.

1 files changed, 7 insertions, 7 deletions

diff --git a/libcxx/include/vector b/libcxx/include/vector
index a8289734e12..8366bb5d11e 100644
--- a/libcxx/include/vector
+++ b/libcxx/include/vector
@@ -433,7 +433,7 @@ __vector_base<_Tp, _Allocator>::__vector_base()
         _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
     : __begin_(nullptr),
       __end_(nullptr),
-      __end_cap_(nullptr)
+      __end_cap_(nullptr, __default_init_tag())
 {
 }
 
@@ -2622,7 +2622,7 @@ vector<bool, _Allocator>::vector()
     _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
     : __begin_(nullptr),
       __size_(0),
-      __cap_alloc_(0)
+      __cap_alloc_(0, __default_init_tag())
 {
 }
 
@@ -2644,7 +2644,7 @@ template <class _Allocator>
 vector<bool, _Allocator>::vector(size_type __n)
     : __begin_(nullptr),
       __size_(0),
-      __cap_alloc_(0)
+      __cap_alloc_(0, __default_init_tag())
 {
     if (__n > 0)
     {
@@ -2672,7 +2672,7 @@ template <class _Allocator>
 vector<bool, _Allocator>::vector(size_type __n, const value_type& __x)
     : __begin_(nullptr),
       __size_(0),
-      __cap_alloc_(0)
+      __cap_alloc_(0, __default_init_tag())
 {
     if (__n > 0)
     {
@@ -2701,7 +2701,7 @@ vector<bool, _Allocator>::vector(_InputIterator __first, _InputIterator __last,
                          !__is_cpp17_forward_iterator<_InputIterator>::value>::type*)
     : __begin_(nullptr),
       __size_(0),
-      __cap_alloc_(0)
+      __cap_alloc_(0, __default_init_tag())
 {
 #ifndef _LIBCPP_NO_EXCEPTIONS
     try
@@ -2754,7 +2754,7 @@ vector<bool, _Allocator>::vector(_ForwardIterator __first, _ForwardIterator __la
                                 typename enable_if<__is_cpp17_forward_iterator<_ForwardIterator>::value>::type*)
     : __begin_(nullptr),
       __size_(0),
-      __cap_alloc_(0)
+      __cap_alloc_(0, __default_init_tag())
 {
     size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
     if (__n > 0)
@@ -2786,7 +2786,7 @@ template <class _Allocator>
 vector<bool, _Allocator>::vector(initializer_list<value_type> __il)
     : __begin_(nullptr),
       __size_(0),
-      __cap_alloc_(0)
+      __cap_alloc_(0, __default_init_tag())
 {
     size_type __n = static_cast<size_type>(__il.size());
     if (__n > 0)